Here's a breakdown of how it might be done, with strong emphasis on caution:
Methods (all require mechanical expertise):
* T-fitting into the fuel line: This is the most common approach. You'll need to:
1. Locate an accessible section of fuel line: Ideally, a relatively straight section near the engine where you can safely clamp and cut the line. This will likely be close to the fuel rail or the fuel injector spider.
2. Safely depressurize the fuel system: Disconnect the negative battery terminal and crank the engine for several seconds to deplete fuel pressure. This is crucial for safety!
3. Cut the fuel line: Use a tubing cutter for a clean cut.
4. Install a T-fitting: This needs to be fuel-compatible (usually steel or brass) and sized to match your fuel line's inner and outer diameter. Use proper fuel-resistant clamps to secure the T-fitting.
5. Connect the test port: Attach a short length of fuel line from the T-fitting to the pressure test port. Make sure all connections are tight and leak-free.
6. Reconnect the fuel system: Carefully reconnect the fuel lines and battery.
7. Test for leaks: Start the engine and carefully check for leaks at all connections. If you find any leaks, turn off the engine immediately and address them.
* Adapting an existing port (if possible): Some TBI systems might have a provision for a test port that's not used. You'd need to find out if your Suburban does and then find a suitable adapter fitting. This is the least intrusive method if it's possible.
* Modifying the fuel rail (most complex and risky): This involves drilling and tapping a hole into the fuel rail to accommodate a test port. This is extremely risky and should only be attempted by experienced mechanics with the right tools and understanding of fuel rail construction and pressures. This is NOT recommended for someone without extensive experience.
Critical Safety Precautions:
* Work in a well-ventilated area: Fuel vapors are highly flammable.
* Wear safety glasses and gloves: Protect yourself from fuel and sharp tools.
* Use appropriate tools: Use tubing cutters and clamps designed for fuel lines.
* Double-check all connections: Ensure all connections are tight and leak-free.
* Have a fire extinguisher readily available: Be prepared for the worst-case scenario.
* Consult a repair manual: A factory service manual for your specific Suburban will show you the fuel system layout and offer critical safety information.
Recommendation:
Unless you have significant experience working with automotive fuel systems, it's strongly recommended to take your vehicle to a qualified mechanic to have the fuel pressure test port installed. The risk of injury or fire is too high to justify attempting this yourself if you lack the necessary expertise. The cost of a professional installation will be far less than the cost of repairing damage from a fuel leak or fire.
